These heavy-duty trailer floorboard screws are essential for securing decking and keeping cargo stable. Made of durable steel with a flat head, these self-tapping screws easily drive floor boards in to metal. At 5/16"-18 thread size and 2.5 inches in length, they provide robust holding power to withstand bouncing cargo and bumpy roads. Sold in a variety of pack sizes, they are perfect for fleet maintenance or DIY trailer repair projects. Just drill pilot holes to start and let the sharp threads do the work of fastening wood, composite or aluminum trailer floors with reliability.